Dog releasing device for door latches



Oct. 20, 1931. ND 1,827,982

DOG RELEASING DEVICE FOR noon uwcnns Filed Sept. 12, 1930 Patented Oct. '20, 1931 UNITED STATES PATENTOOFFICE FLETCHER D.GRUND, OF WESTON, OHIO, ASSIGNORTO THE AMERICAN SWISS COMPANY,

OF TOLEDO, OHIO, A. CORPORATION OF OHIO DOG aELEAsmG DEVICE r012. noon. LATCHES R l S S U Application filed September 12; 19 80. Serial No. 481,390.

This invention relates to door latches but more particularly to latches adapted for use on automobiles and other vehicles, and an object is to produce a latch which automatically releases-the outside retractor upon retraction of the latch bolt from the inside as upon slamming the door, so that should the latch be dogged or locked and then the door closed, the action of closing the door operates to move or release the locking or dogging element away from locking position.

Further objects will hereinafter appear, and by way of illustration but not of limitation, an embodiment of the invention 1s shown on the accompanying drawings, in which Fig. 1 is a side elevation of a door latch, the strap or link leadin to the remote control unit being shown in ragment; and

Fig. 2 is an enlarged sectional view on the line 2-2 of Fig. 1, showing the connection between the remote-operated strap and the latch bolt.

The illustrated embodiment of the invention comprises a latch unit having a back plate, provided with an upstanding face plate 2 which is apertured to receive a latch bolt head 3. The head 3 is riveted to a bolt plate 4 and a spiral spring 5 bears against the rear face of the bolt head 3 urging the same to projected or latchin position. A headed pin 6 mounted on an em bossed part 7 of the back plate lextends into an elongate slot"8 in the bolt plate, thereby guiding the movement of the latch bolt over the back plate.

For retracting the latch bolt from the outside, a roll back 9 having a squared handlereceiving opening 10, is mounted on the back plate 1, a cover plate 11 extending over the roll back to retain the same in position. Projecting from the hub of the roll back is a hook-shaped arm 12 for/a purpose hereinafter described.

Although this invention is not limited to remote control latches, there is shown a strap or link 13 which leads to a remote control handle (not shown). Mounted on the inner end of the strap is a rivet 14 projecting at right angles into an elongate slot 15 in the 50 bolt plate 4, a spring washer 16 being interposed between the bolt plate and strap to eliminate rattling of the parts.

It will be apparent from an inspection of Fig. 1 that by movement of the rivet 14 into engagement with the right hand edge of the slot 15, retraction of the latch bolt by the strap 13 can be accomplished. It is further apparent that movement of the strap 13 in non-bolt retracting direction (to the left of Fig. 1) can be accomplished when the latch bolt is 1n projected or latching position. When the rivet is moved to a position be neath the 'outer end portion of the arm 12, movement of the roll back 9 is blocked, or in other words, dogging of the roll back is effected.

A cardinal feature of this invention resides in so constructing and-arranging the parts that when the door is slammed the dogging element (rivet 14, in this case) is automatically moved away from dogging position, thereby releasing the roll back. As shown, the length of the elongate slot 15 is so chosen with relation to the endportion of the arm 12, that when the rivet 14 is in its left hand position and the bolt is retracted, as by slamming the door, the left hand edge of the slot 15 positively moves the rivet away from the dogging arm 12. In this manner, accidental locking of the door from the inside before slamming is rendered ineffective and in order to lock the door, the latter must be in closed position before the rivet 14 is moved to dogging position.

Numerous changes in details of construction, arrangement and operation may be effected without departing from the spirit of the invention, especially as defined by the claim.

What I claim is:

-In-a door latch, a latch bolt, a plate rigid with said bolt and having therein a slot extending in the direction of movement of said bolt, outside retracting means including a roll back for said bolt having a contact surface movable laterallyacross said slot when the roll back is operated to retract thebolt, and inside .retracting means including a retracting device having a member extending through said slot and the end of said member being in the path of said surface when said member is in the end of the slot toward the rejected bolt, the parts bein so proportloned that, when movement 0 the bolt to normal retracted position, said end of the slot forces said member out of the path of said contact surface.

In testimony whereof I have hereunto signed my name to this specification. FLETCHER D. GRUND. 

